Pump Troubleshooting - Graco UniDrum C59784 Instructions And Parts List

Troubleshooting

Pump Troubleshooting

For additional information about the displacement Pump, refer to Related Manuals on page 3 to find the applicable
instruction manual.
Problem
Rapid downstroke or upstroke
(pump cavitation)
Material leaks around Pump outlet
Material leaks around Bleed Port (Q) Bleed Port fitting is loose.
Pump won't move up or down
Wet cup leaks
40
Cause
Air is trapped in Pump.
Downstroke: Lower check in Pump
is worn.
Upstroke: Upper check in Pump is
worn.
Outlet fitting is loose.
Problem with air motor.
Foreign object lodged in Pump.
Worn throat packings.
Solution
Bleed air from the Pumps and prime
using the procedure described in
steps 16a - 16h on page 25.
Rebuild and replace Pump, as
necessary.
Tighten outlet fitting.
Tighten Bleed Port fitting.
See Air Motor Troubleshooting
chart on page 41.
Remove object and rebuild Pump
assembly.
Tighten wet cup. Replace throat
packings.
309169ZAF